If you have sent the proof owner a to-do list and have noticed that a to-do was missing, you can ask the proof owner to revert the to-do list. This action will unlock the proof so you can amend the to-do list.

Reverting the to-do list can only be actioned by the proof owner.
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Click the cog icon to open the manage pane.

In the to-do list section, select revert to-do list.

Add a message if you like, and then click accept & continue.

Reverting the to-do list will send the proof back to the approver (or gatekeeper) who sent the to-do list. This person will be notified by email that the proof has been unlocked.